Hp financial calculator case

thingiverse

I made this clam shell case for the HP 10bII+ calculator. It has a special spot for extra batteries. Post-Printing: I sanded the hinge to make sure it opens and closes smoothly. To do that, I carefully threaded a strip of sandpaper through the male gap in the hinge and gently rubbed it until it was silky smooth, making sure not to leave any scratches on the female connectors.